print instr("123456789","456");" = 4?"
print INSTR("123456789","654");" = 0?"
print INSTR("1234512345","34");" = 3?"
print INSTR("1234512345","34",6);" = 8?"
print INSTR("1234512345","34",6,2);" = 0?"
print INSTR("1234512345","34",6,4);" = 8?"
